https://devzone.nordicsemi.com/f/nordic-q-a/46234/unexpected-disconnection-with-ios-devicesHi to all, i am developing a device with nrf52840 soc and soft device 14 and SDK 15. my device work well with Android, Windows, Google web ble but it experience unexpected disconnection event with iOS devices in this way that after roughly 2min linken-USTelligent Community 13Sat, 20 Apr 2019 22:49:08 GMThttps://devzone.nordicsemi.com/thread/182897?ContentTypeID=1Sat, 20 Apr 2019 22:49:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:41a7e2b4-7031-4574-953d-31ac0e4974adalireza sadeghpour<p>Hi, thanks for your response. after reading apple developer guides(<span><a href="https://developer.apple.com/accessories/Accessory-Design-Guidelines.pdf">https://developer.apple.com/accessories/Accessory-Design-Guidelines.pdf</a>)</span></p> <p>my problem solved.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/182288?ContentTypeID=1Tue, 16 Apr 2019 08:26:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b64fe20b-2dd3-4dba-9dce-95d598e0a30eVidar Berg<p>Hi,</p> <p>The sniffer log indicates that the peripheral is disconnects because of &quot;unacceptable connection parameters&quot;. So the connection parameters you are requesting from the peripheral are most likely rejected by the iPhone.&nbsp;</p> <p>I would recommend reading&nbsp;section 23.6 of the Accessory design guidelines document (<a href="https://developer.apple.com/accessories/Accessory-Design-Guidelines.pdf">link</a>) to help determine what connection interval you want to use. Also, on the Nordic side, connection parameter negotiation is typically handled by the&nbsp;&nbsp;<a href="https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.3.0/lib_ble_conn_params.html?cp=5_0_3_2_4">Connection parameters negation module</a>. It&#39;s optional to disconnect even if the preferred connection params are rejected.</p><div style="clear:both;"></div>